Carbureter.



|. 1w.' SMITH.

CARBURETER.

APPLICATION FILED AUG.19, 1912.

Patented Oct. 26, 1915.

2 SHEETS-SHEET l.

I. M. SMITH. CARBURETER.

APPLICATION FILED AUG.I9. I9I2.

Patented OCI. 26, 1915.

2 SHEETS-SHEET 2.

' I AOR/v550' titi" @dllhlhd IVAN M. SMITH, 0F SOTH MILWAUKEE, WISCONSIN, ASSIGNOR OF ONEHAI1F TU MITCHELL L. EYKSE, 0F SOUTH MILW'AUKEE, WISCONSIN.

CARBURETEBZ.

Specineation of Letters Patent.

rateatea oet. ee, reis.

application led August 19, 1912. Serial No. 715,711.

. zen of the United States, residing at South Milwaukee, county of Milwaukee, and State vof Wisconsin, have invented new and useful Improvements in Carbureters, of which the following is a specification.

My invention relates to improvements in carbureters.

The object of my invention is to provide a form of carbureter in which the fuel deliv* ery may be regulated by the entering air currents in such a manner as to approximately maintain the proper proportions of fuel and air delivery to the mixing chamber.

A further object of my invention is to provide means whereby theA fuel delivery iny approximately proper quantity will not be dependent upon the maintenance ot a conetant level of oil in the supply' chamber or reservoir. y

A further object of my invention is to provide means whereby fuel delivery during periods when the engine is not in operation will be absolutely prevented.

ln connection ,with the foregoing objects, my invention contemplates suitable means for varying the proportionate quantities ot vfuel and air delivered in accordance vwith the requirements for different irinds ont' worlr.

ln the drawings, lligure 'l is a sectional view of a carbureter embodying my inven-n tion, drawn to a plane cutting the axes oit fuel and air inlets and mixture outlet. Fig. 2 is a halfplan view of a portion of a caru "bureter i embodying my invention. Fig.. 3

is a sectional view, drawn on line m-x est Fig. 1; y Fig. 4. is a sectional view, drawn on line 1h-j ot' Fig: Il.v Fig. 5 is a rear end elevation .partially brolren away to show the turbine er impact motor, the auxiliary air inlet portion ot the casing being omitted. lligq is a artial elevation et the opposite or iront en of my improved carbureter.

Lige parts are identified by the same rei"-1 erence characters throughout the several views.

filtre casing 1 of my carbureter is formed .to provide a mining chamber 2 having an outletat 3, :which communicates with the v'eylinder-o'lan internal combustion rnotor.`

uit.tulnllar4 memberu' extends across the een eral portion et the ,mining chamber, and is jprovided with a noaale 6 through which the titi.

tuel may be delivered to said chamber.. The

. is not otherwise held open.

tubular member 5 .is enlarged near its front end and a valve 8 is adapted to seat upon the shoulder 10 formed by the enlargement ot the member 5. A spring 12 is interposed between tlle -valve 8 and an exterior cap 13, which covers the projecting end of the tubular member' 5, this spring serving to automatically seat the valve 8 when the latter Liquid fuel is conveyed from any suitable source of' supply through a duct 14, which delivers it through cap aperture 15 to the space occupied by the spring 12.

A cylindrical slide valve 1S is mounted in thetubular member 5 and is provided with a fuel delivery slot 19, adapted to move into and out of registry with the nozzle cavity i8 communicating with the nozzle 6. rllhe cylinder 18 is hollow and ducts 2() lead inwardly from its front end, whereby liquid passing the valve 8-will be permitted to enter this cylinder and to pass. from the cylinder through the elongated port or slot 19 to the nozzle G when the cylindrical valve is in a position with the slot in registry with said nozzle cavity 48.

'.lhe cylindrical slide valve 18 is actuated by means of a rotary'turbine wheel or im pact motor the'hub oi? which is secured to an internally threaded feed nut 26, having threaded engagement with a valve actuating stem27. Said 'valve actuating stem preterably extends'through the cylindrical slide,

valve 18, and' has a screw threaded portion 28 in threaded engagement' with the front end portion vor said valve 18, as clearly shownuin Fig. 1. The valve 18 is held 'against rotation by a key 29. W ith this construction, it is obvious that a rotation of the turbine wheel 25 in one direction will cause the stem 27 to move forwardly as the feed nut 26 rotates with the wheel 25. A ro tation of wheel 25 in the other direction will of course retract stem 27.

Air is admitted to the mixing chamber 2 through inlets at 35, which direct the inconr ing air against the vanes 36 of the turbine wheel 25. lhe impact of the airupon the varies 36 causes wheel 25 to rotate in a di rection tov move the slide valve 18 forwardly spring `is wound upon and connectedwith titl at I

the hub of the turbine wheel, with its outer end connected to a worm wheel 111, by which the tension ofthe spring 40 may be adjusted. The worm wheel 41 maybe actuated from the exterior by means of a worm shaft 42 provided with a knob 43. A set screw 44 mav be employed to lock the worm shaftv in any desired position of adjustment. By varying the tension of the spring 4Q, the degree of rotation of wheel; 25 may be con' trolled.

In normal position, the slot 19 may be wholly out of registry with the nozzle 6, or its front end may extend to the nozzle cavity 48 so as to Apermit the delivery of a slight quantity of fuel tol saidl cavity 48 inthe wall of the member 5,r thus allowing a delivery of a small quantity of fuel to the nozzle with the valve in this position. When the valve is moved forwardly, however, the

fuel delivery is increased in proportion to the area of the slot 19, which is .brought in registry with the nozzle cavity 48.. It is therefore obvious that as the velocity of the air through the air inlet ports is increased,

the rotation of wheel 25 will be proportionately increased, thus moving the valve 18 .forwardly a correspohdingly 'greater distance and uncovering a greaterarea of the.

feedslot or port 19.

A ring valve member 50 encircles that portion of the casing which is provided with the air inlet ports 35. This ring valve member is provided* with stationary vanes 51 and intervening air ports 52, which, when in registry with the ports 35, allow the air to pass to the vanes 36 of the turbine. When the/ring 5() is adjuste-d to open the airports, a segmental shoulder 55 carried by the ring is utilized to actuate rod 56, `pushingthe latter inwardly through the valve stem 27 toliactuate the main valve 8 to open position. The segment 55 actuates push rod57. This bears at its rear end upon a set screw 58 carried by a lever 60 which is pivoted to the rear wall of the4 vcasing with one arxnin position to bear upon the rear end of said push rod 56.v

The spring 63 restores lever to normal position, when segment 55 is out of registry with the rod 57, thus allowing valve 8 to close under the pressure-of spring 12.

The easing 1 is provided with a Awater circulation cavity 70, and is also provided with an auxiliary air admission port at 71, normally closed by a spring actuated valve 72, which opens only under excessive suction or under manual pressure.

'Assuming all lthe ports to bein normal position, with main valve 8 closed and the annular air valve ring 50 also in a position to close the air ports 35, it is obvious that neither fuel nor air can be delivered. By rotating the air valve 50 to uncover air ports 35, the main valve 8 will be opened through the medium of segment 55 engaging the end of rod 57 and forcing the latter backwardly to actuate lever 60 and rod 56. Liquid fuel will then be permitted to flow past valve 8 to the interior portions of member 5 and .through the ducts 20 to an annular chan# ports valve stem 27 and move the valve 18 inwardly, thus increasing the exposed area of valve port 19, with a'corresponding increase in liquid delivery proportionate to the volume of air entering through the ports 35. slot port 19 should be located to deliver any liquid to the nozzle cavity 48 when the valve 18 is in its normal position, but it will be found that better results will be secured by allowing for a slight` delivery of liquid` to the nozzle in advance of the initial air-delivery.

It is of course not essential that the With the described construction, the liq.`

uid deliveredtlu'ough the nozzle may be so accurately regulated by the valve 18, having a long narrow port 19 controlled as to position by the turbine, that ordinary variations in the level of the liquid fuel delivered through the duct 14 may be disregarded. In case of extraordinary variations or in case of radical differences in the density of the- -liqnid fuel employed at different times, the

oil'. deliwe ed 'may be easily regulatedl'by. means of the worm shaft'42 used foradjusting the tension of sprin 40, the degree of turbine wheelrota'tion bemg thus controlled.

Referring to Figs. 3 and 4,`it will be observed that the slot port 19 is not formed in the main body of the slide valve cylinder 18,

but that said cylinder is provided with a removable section 80, in which the slot port y 19 is located. This feature, however, is

purely structural and is adopted with a View to accuracy and convenience in'formlngthe slot port.

l claix'nv- 1. The combination with a carbureting chamber provided with an air inlet and a.

mixture outlet, of a tubular member crossing said chamber and projecting into the aircontrolling the delivery of liquid fuel "from said tubular passage into the nozzle and connections between said impact motor and valve.`

2. The combination with a carbureting chamber provided with an air inlet and a mixture outlet, of a tubular member crossing said chamber and projecting into the air inlet, said member constituting a fuel inlet, a nozzle communicating with said membei and projecting laterally from the member in the direction of the outlet, a rotary impact motor located in the air inlet, a valve controlling the delivery of liquid fuel from said tubular passage into the nozzle and connections between said impact motor and valve, said impact motor and chamber wall constituting an air inlet passage vand said pas sage being provided with a manually adjustable throttle valve.

3. The combination with a carbureting chamber having air and fuel inlets and a mixture outlet, of a tubular non-rotatable slide valve controlling the fuel inlet, a screw threaded valve stem, and a rotary member in the path of the air from the air inlet, adapted to be actuated by the air and carry-- ing a feed nut in threaded connection with said valve stem.

4. The combination with a carbureting chamber having air and fuel inlets and a mixture outlet, of a slide valve controlling delivery through the fuel inlet, a valve stem, an air driven turbine located in the air inlet in feed screw connection with the stem, and means for automatically moving the valve toward closing position during the intervals between periods of air delivery, said turbine being operatively connected to open the valve during air delivery. 5L rlhe combination with a carbureting chamber having air and fuelinlets and a mixture outlet, of a non-rotatable valve con trolling delivery through the fuel inlet, an air actuated rotary member in the path of air entering through the air inlet, said rotary member being held against longitudinal movement, a feed screw connection between the rotary member and valve adapted to open the valve in direct vproportion to the air delivery past the rotary member, a spring adapted to retractively rotate the rotary member, and means for manually regulating the delivery of air to said chamber.

6. The combination withr a carbureting chamber having air and fuel inlets and a mixture outlet, of a tubular member con nected with the fuel inlet and provided with a nozzle within said chamber, a main valve controlling the delivery of fuel to said chamber, a tubular slide valve within said member, provided with a slotted pbrt and controlling delivery of fuel to the nozzle, an air driven turbine adapted to actuate the slide valve, a manually actuated air valve controlling the air inlet, and means, connected therewith, for opening said main valve simultaneously with the opening of the air valve. i

7 The combination with a carbureting chamber having air and fuel inlets and 'a mixture outlet, of a tubular member connected with the fuel inlet and provided with a nozz e cavity and nozzle within said chamber a non-rotatable slide valve having a slotted port and controlling the delivery of fuel to saidnozzle, and an air actuated turbine driven by air entering through the air inlet for automatically adjusting said slide valve to secure a progressively increasing registry of said slot with the nozzle cavity in proportion to the increase in quantity of air delivered. 1

8. The combination with a carbureting chamber having air and fuel inlets. and-a mixture outlet, of a tubular member connected with the fuel inlet and provided with anozzle cavity and nozzle within said cham ber, a slide valve-having a `Slotted port and progressively controlling the delivery of fuel to said nozzle, means controlled as to valve opening movements by the velocity of the air entering through. the air inlet, for adjusting said slide valve, and means for automatically closing said valve when air delivery ceases, together with a main valve for shutting oil the supply of fuel to the tubular member.

9. The combination with a carbureting chamber having air and fuel inlets and a mixture outlet, of a. tubular member connected with the fuel inlet and provided with a nozzle within said chamber, a slide valve having a slotted port and progressively con trolling the delivery of fuel to said nozzle, and means controlled by the velocity of the air entering through the air inlet, for adjusting said slide valve, together with a main valve for shutting 0H the supply of fuel to the tubular member, an air valve, and connections between the air valve and main valve adapted to transmit motion from one to the other.

ln testimony whereof aiix my signature in the presence of two wltnesses.

ivan M. siiirii.

Witnesses:

Lsvnnn'r'r C. WHEELER, T. F. HANNAN. 

